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If doing so does not help, I recommend you get in touch with our technical support team who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports - if they are unable to fix it for you, they will at least be able to document the issue for further investigation.
Hope this helps!
Mark good posts by pressing the like button, and select the best answer on questions you've asked to help others find solutions.